JP2011028071A - Imaging apparatus - Google Patents

Imaging apparatus Download PDF

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Publication number
JP2011028071A
JP2011028071A JP2009175020A JP2009175020A JP2011028071A JP 2011028071 A JP2011028071 A JP 2011028071A JP 2009175020 A JP2009175020 A JP 2009175020A JP 2009175020 A JP2009175020 A JP 2009175020A JP 2011028071 A JP2011028071 A JP 2011028071A
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Prior art keywords
cylinder
cam
lens
group
rectilinear
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JP2009175020A
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JP5570156B2 (en
JP2011028071A5 (en
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Kenichi Katano
健一 片野
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Canon Inc
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Canon Inc
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Priority to JP2009175020A priority Critical patent/JP5570156B2/en
Priority to CN2010102328489A priority patent/CN101986181B/en
Priority to US12/840,714 priority patent/US8179612B2/en
Publication of JP2011028071A publication Critical patent/JP2011028071A/en
Publication of JP2011028071A5 publication Critical patent/JP2011028071A5/en
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
    • G02B7/021—Mountings, adjusting means, or light-tight connections, for optical elements for lenses for more than one lens
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B17/00—Details of cameras or camera bodies; Accessories therefor
    • G03B17/02—Bodies
    • G03B17/04—Bodies collapsible, foldable or extensible, e.g. book type

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lens Barrels (AREA)
  • Structure And Mechanism Of Cameras (AREA)
  • Studio Devices (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide an imaging apparatus, having a lens barrel unit of a collapsible type and being excellent in light blocking effect. <P>SOLUTION: The lens barrel unit 2 of the collapsible type has: a cam cylinder 30 having an opening in which a first group cylinder 12 holding a first group lens 11 is inserted and a cam groove 33 for controlling the movement of the first group lens 11 in the direction of an optical axis by engaging with the first group cylinder 12; and a rectilinear cylinder 40 inserted into and engaged with the cam cylinder 30 and moved in the direction of the optical axis together with the cam cylinder 30. The first group cylinder 12 has an annular step part 17 formed by a diameter larger than an opening in the leading end of the cam cylinder 30. In a photographing state, the face 17a, which is closest to a subject side in the annular step part 17, is located on the subject side closer than the face which is closest to the subject side in the rectilinear cylinder 40. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は撮像装置に関する。   The present invention relates to an imaging apparatus.

特許文献１は、レンズ保持筒に、カム筒の開口径よりも大きな環状段差部を形成すると共に、撮影状態においてカム筒に係合する直進筒の先端部を後方部分よりも前方に突出させたレンズ鏡筒を開示している。   In Patent Document 1, an annular stepped portion larger than the opening diameter of the cam cylinder is formed in the lens holding cylinder, and the front end portion of the straight cylinder that engages with the cam cylinder in the photographing state is protruded forward from the rear portion. A lens barrel is disclosed.

特開２００７−３４０６９号公報JP 2007-34069 A

しかしながら、特許文献１は、カム筒の開口を規定する面とレンズ保持筒の前方部分との間の隙間から光線が入射し、直進筒の先端部とレンズ保持筒の後方部分との間の隙間に侵入して遮光性が不十分となるおそれがある。   However, Patent Document 1 discloses that a light beam is incident from a gap between a surface that defines the opening of the cam cylinder and a front portion of the lens holding cylinder, and a gap between a tip portion of the rectilinear cylinder and a rear portion of the lens holding cylinder. There is a risk that the light shielding properties will be insufficient.

本発明は、遮光性に優れた撮像装置を提供することを例示的な目的とする。   An object of the present invention is to provide an imaging device having excellent light shielding properties.

本発明の一側面としての撮像装置は、沈胴式のレンズ鏡筒ユニットを有する撮像装置であって、前記レンズ鏡筒ユニットは、レンズを保持するレンズ保持筒と、前記レンズ保持筒が挿入される開口と、当該レンズ保持筒と係合して前記レンズの光軸方向への移動を制御するカム溝と、を有するカム筒と、前記カム筒に挿入及び係合して前記カム筒と共に前記光軸方向に移動する直進筒と、を有し、前記レンズ保持筒は、前記カム筒の先端における前記開口の径よりも大きな径で形成された環状段差部を有し、撮影状態では、前記環状段差部の最も被写体側にある面は前記直進筒の最も被写体側にある面よりも被写体側に位置することを特徴とする。   An imaging apparatus according to an aspect of the present invention is an imaging apparatus having a retractable lens barrel unit, and the lens barrel unit includes a lens holding cylinder that holds a lens and the lens holding cylinder inserted therein. A cam cylinder having an opening and a cam groove engaging with the lens holding cylinder to control movement of the lens in the optical axis direction; and inserting and engaging the cam cylinder with the light The lens holding cylinder has an annular step portion formed with a diameter larger than the diameter of the opening at the tip of the cam cylinder. The surface of the stepped portion that is closest to the subject is positioned closer to the subject than the surface of the straight cylinder that is closest to the subject.

本発明は、遮光性に優れた撮像装置を提供することができる。   The present invention can provide an imaging device having excellent light shielding properties.

本実施例の撮像装置の斜視図である。It is a perspective view of the imaging device of a present Example. 図１に示すレンズ鏡筒ユニットの斜視図である。It is a perspective view of the lens barrel unit shown in FIG. 図２に示すレンズ鏡筒ユニットの分解斜視図である。FIG. 3 is an exploded perspective view of the lens barrel unit shown in FIG. 2. 図２に示すレンズ鏡筒ユニットの撮影状態の断面図である。It is sectional drawing of the imaging | photography state of the lens-barrel unit shown in FIG. 図２に示すレンズ鏡筒ユニットの沈胴状態の断面図である。It is sectional drawing of the retracted state of the lens-barrel unit shown in FIG. 図１に示すレンズ鏡筒のカム筒と直進筒の斜視図である。FIG. 2 is a perspective view of a cam barrel and a rectilinear barrel of the lens barrel shown in FIG. 1. 図６に示すカム筒と直進筒の沈胴状態の側面図である。FIG. 7 is a side view of the retracted state of the cam cylinder and the rectilinear cylinder shown in FIG. 6. 図６に示すカム筒と直進筒の撮影状態の側面図である。It is a side view of the imaging state of the cam cylinder and the straight advance cylinder shown in FIG. 図６に示すカム筒の展開図である。FIG. 7 is a development view of the cam cylinder shown in FIG. 6. 図４の部分拡大断面図である。It is a partial expanded sectional view of FIG.

図１は、本実施例の撮像装置（デジタルカメラ）の斜視図である。図１に示すように、撮像装置は、カメラ本体１とレンズ鏡筒ユニット２を有する。レンズ鏡筒ユニット２は、撮影時にカメラ本体１から繰り出し（突出し）、収納時にカメラ本体１に繰り込む（沈胴する）沈胴式の鏡筒である。   FIG. 1 is a perspective view of the image pickup apparatus (digital camera) of this embodiment. As shown in FIG. 1, the imaging apparatus includes a camera body 1 and a lens barrel unit 2. The lens barrel unit 2 is a collapsible lens barrel that extends (projects) from the camera body 1 during photographing and retracts (collapses) into the camera body 1 during storage.

図２はレンズ鏡筒ユニット２の斜視図、図３はレンズ鏡筒ユニット２の分解斜視図、図４はレンズ鏡筒ユニット２の撮影状態の断面図、図５はレンズ鏡筒ユニット２の沈胴状態の断面図である。   2 is a perspective view of the lens barrel unit 2, FIG. 3 is an exploded perspective view of the lens barrel unit 2, FIG. 4 is a sectional view of the lens barrel unit 2 in a photographing state, and FIG. It is sectional drawing of a state.

レンズ鏡筒ユニット２は１群筒ユニット１０、２群筒ユニット及び３群筒ユニットを有する二段沈胴式であり、撮影時と沈胴時で図３〜図５に一点鎖線で示す光軸方向の長さを変化させることができる。レンズ鏡筒ユニット２は１群レンズ１１、２群レンズ２０及び３群レンズ９０からなる３群の撮影レンズ群で構成される。１群レンズ１１は１群筒ユニット１０の１群筒１２に、２群レンズ２０は２群筒ユニットの２群ホルダ２１に、３群レンズ９０は３群筒ユニットの３群ホルダ９１に保持されている。   The lens barrel unit 2 is a two-stage collapsible type having a first group cylinder unit 10, a second group cylinder unit, and a third group cylinder unit, and in the optical axis direction indicated by a one-dot chain line in FIGS. The length can be changed. The lens barrel unit 2 includes three groups of photographic lens groups including a first group lens 11, a second group lens 20, and a third group lens 90. The first group lens 11 is held by the first group cylinder 12 of the first group cylinder unit 10, the second group lens 20 is held by the second group holder 21 of the second group cylinder unit, and the third group lens 90 is held by the third group holder 91 of the third group cylinder unit. ing.

１群筒ユニット１０は、１群筒（レンズ保持筒）１２、１群カバー１３、バリア羽根１４、１群キャップ１５を有する。１群筒１２の外周端部には１２０度の等間隔で３つのカムピン１６が径方向に突出している。カムピン１６は、後述するカム筒３０のカム溝３３に係合する。バリア羽根１４はレンズ鏡筒ユニット２の動作に連動して図４に示す撮影状態では開口Ｐを開き、図５に示す沈胴状態では開口を閉じる。   The first group cylinder unit 10 includes a first group cylinder (lens holding cylinder) 12, a first group cover 13, a barrier blade 14, and a first group cap 15. Three cam pins 16 protrude in the radial direction at equal intervals of 120 degrees at the outer peripheral end of the first group cylinder 12. The cam pin 16 is engaged with a cam groove 33 of the cam cylinder 30 described later. The barrier blade 14 opens the opening P in the photographing state shown in FIG. 4 in conjunction with the operation of the lens barrel unit 2, and closes the opening in the retracted state shown in FIG.

２群筒ユニットはバヨネット結合されたカム筒３０と直進筒４０とを有し、カム筒３０には２群ホルダ２１が係合している。即ち、２群ホルダ２１の外周には、１２０度の等間隔で配置されて径方向に突出する３つのカムピン２２が設けられ、カムピン２２は、後述するカム筒３０のカム溝３４に係合する。また、バヨネット結合によりカム筒３０と直進筒４０は光軸方向に共に移動する。   The second group cylinder unit includes a cam cylinder 30 and a rectilinear cylinder 40 that are bayonet-coupled, and the second group holder 21 is engaged with the cam cylinder 30. That is, on the outer periphery of the second group holder 21, three cam pins 22 that are arranged at equal intervals of 120 degrees and project in the radial direction are provided, and the cam pins 22 engage with cam grooves 34 of a cam cylinder 30 described later. . Further, the cam cylinder 30 and the rectilinear cylinder 40 move together in the optical axis direction by the bayonet coupling.

図６はカム筒３０と直進筒４０の拡大斜視図であり、カム筒３０の一部を破断して示している。図７は沈胴状態のカム筒３０と直進筒４０の側面図であり、図８は撮影状態のカム筒３０と直進筒４０の側面図である。   FIG. 6 is an enlarged perspective view of the cam cylinder 30 and the rectilinear cylinder 40, and shows a part of the cam cylinder 30 cut away. FIG. 7 is a side view of the cam cylinder 30 and the rectilinear cylinder 40 in the retracted state, and FIG. 8 is a side view of the cam cylinder 30 and the rectilinear cylinder 40 in the photographing state.

カム筒３０は、図６に示すように、キャップ３１と円筒部３２を有する。キャップ３１は円筒部３２と一体に形成されてもよい。   As shown in FIG. 6, the cam cylinder 30 has a cap 31 and a cylindrical portion 32. The cap 31 may be formed integrally with the cylindrical portion 32.

キャップ３１は断面Ｌ字形状を有し、カム筒３０の１群筒ユニット１０側の先端部に設けられる遮光部材である。キャップ３１は、円筒部３２の１群筒ユニット１０側の上面を覆う前部３１ａと、円筒部３２の１群筒ユニット１０側の側面の一部を覆う側部３１ｂと、を有する。   The cap 31 has an L-shaped cross section, and is a light shielding member provided at the tip of the cam cylinder 30 on the first group cylinder unit 10 side. The cap 31 has a front part 31 a that covers the upper surface of the cylindrical part 32 on the first group cylinder unit 10 side, and a side part 31 b that covers a part of the side surface of the cylindrical part 32 on the first group cylinder unit 10 side.

円筒部３２は、中央部３２ａ、端部３２ｂ及び張り出し部３２ｃを有する。   The cylindrical portion 32 has a central portion 32a, an end portion 32b, and an overhang portion 32c.

中央部３２ａの１群筒ユニット１０側の側面端部にはキャップ３１の側部３１ｂが取り付けられる段差が設けられて側部３１ｂの外面と円筒部３２の中央部３２ａの外面とが同一の高さになるように構成されている。   A step to which the side portion 31b of the cap 31 is attached is provided at the side surface end portion of the central portion 32a on the first group cylinder unit 10 side so that the outer surface of the side portion 31b and the outer surface of the central portion 32a of the cylindrical portion 32 have the same height. It is comprised so that it may become.

図９は、カム筒３０の円筒部３２の内面を円周方向に展開した平面図である。同図に示すように、円筒部３２の内面には、カム溝３３及び３４が円周方向に３本ずつ設けられている。また、円筒部３２の内面には、円周方向に亘って係合溝３５が設けられている。   FIG. 9 is a plan view of the inner surface of the cylindrical portion 32 of the cam cylinder 30 developed in the circumferential direction. As shown in the figure, three cam grooves 33 and 34 are provided on the inner surface of the cylindrical portion 32 in the circumferential direction. Further, an engagement groove 35 is provided on the inner surface of the cylindrical portion 32 over the circumferential direction.

カム溝３３には１群筒ユニット１０のカムピン１６が係合し、カム溝３３は１群筒ユニット１０の光軸方向への移動（量）を制御する。カム溝３４には２群ホルダ２１のカムピン２２が係合し、カム溝３４は２群ホルダ２１の光軸方向への移動（量）を制御する。カム筒３０の回転と直進筒４０の回転規制により、１群筒ユニット１０と２群ホルダ２１は光軸方向へ進退可能となっている。カム溝３３とカム溝３４は異なる形状を有し、互いに重ならないように配置されている。カム溝３４の一部は張り出し部３２ｃにも延びている。   The cam groove 16 engages with the cam pin 16 of the first group cylinder unit 10, and the cam groove 33 controls the movement (amount) of the first group cylinder unit 10 in the optical axis direction. The cam groove 22 engages with the cam pin 22 of the second group holder 21, and the cam groove 34 controls the movement (amount) of the second group holder 21 in the optical axis direction. By the rotation of the cam cylinder 30 and the rotation restriction of the rectilinear cylinder 40, the first group cylinder unit 10 and the second group holder 21 can advance and retract in the optical axis direction. The cam groove 33 and the cam groove 34 have different shapes and are arranged so as not to overlap each other. A part of the cam groove 34 also extends to the overhang portion 32c.

係合溝３５は円筒部３２の円周方向に延びているが、一部に係合溝３５は、１２０度間隔で配置された傾斜溝３６とホーム部３７とを有する。係合溝３５には、後述する直進筒４０の係合部４２が係合する。傾斜溝３６は、カム筒３０と直進筒４０の光軸方向の相対位置が変化することを可能にするために、係合溝３５とは異なり、図９に示す円周方向（長手方向）と平行ではなく傾いている。   Although the engaging groove 35 extends in the circumferential direction of the cylindrical portion 32, the engaging groove 35 includes inclined grooves 36 and home portions 37 that are arranged at intervals of 120 degrees. An engaging portion 42 of a rectilinear cylinder 40 to be described later engages with the engaging groove 35. Unlike the engagement groove 35, the inclined groove 36 differs from the circumferential direction (longitudinal direction) shown in FIG. 9 in order to allow the relative position of the cam cylinder 30 and the rectilinear cylinder 40 to change in the optical axis direction. They are not parallel but inclined.

端部３２ｂは、円筒部３２の３群筒ユニット側に設けられ、中央部３２ａよりも径方向に突出して段差を形成している。カム溝３３は中央部３２ａの内面に設けられているが、カム溝３４の一部は、図６に示すように、端部３２ｂの一部にも延びる（と共に図９に示すように張り出し部３２ｃにも延びている）。   The end portion 32b is provided on the third group cylinder unit side of the cylindrical portion 32, and protrudes in the radial direction from the central portion 32a to form a step. Although the cam groove 33 is provided on the inner surface of the central portion 32a, a part of the cam groove 34 extends to a part of the end portion 32b as shown in FIG. 6 (and an overhanging portion as shown in FIG. 9). 32c).

端部３２ｂの外面には１２０度の等間隔で配置された３つの駆動ピン３８と、１２０度の等間隔で配置された３つのカムピン３９が設けられている。駆動ピン３８は回転筒６０のキー溝６１と係合し、カム筒３０は回転筒６０と共に回転する。カムピン３９は固定筒７０のカム溝７１と係合し、カム溝７１の軌跡に倣ってカム筒３０が光軸方向へ移動する。   On the outer surface of the end portion 32b, there are provided three drive pins 38 arranged at equal intervals of 120 degrees and three cam pins 39 arranged at equal intervals of 120 degrees. The drive pin 38 engages with the key groove 61 of the rotary cylinder 60, and the cam cylinder 30 rotates together with the rotary cylinder 60. The cam pin 39 engages with the cam groove 71 of the fixed cylinder 70, and the cam cylinder 30 moves in the optical axis direction along the locus of the cam groove 71.

３つの張り出し部３２ｃが、端部３２ｂの端部から光軸方向に沿って３群筒ユニット側に突出している。張り出し部３２ｃは、直進筒４０の対応する切欠部４８に挿入及び退避可能である。図９に示すように、張り出し部３２ｃにはカム溝３４の一部が延びている。図９においては、張り出し部３２ｃは台形形状を有し、張り出し部３２ｃを除いたカム筒３０の光軸方向の長さは図９のＬである。本実施例では、後述するように、張り出し部３２ｃの光軸方向の長さ分（図９に示すＬ１）だけによる光軸方向におけるカム筒３０の長さ（従って、レンズ鏡筒ユニット２の長さ）を短縮している。   The three overhang portions 32c protrude from the end portion 32b toward the third group cylinder unit along the optical axis direction. The overhang portion 32 c can be inserted into and retracted from the corresponding cutout portion 48 of the rectilinear cylinder 40. As shown in FIG. 9, a part of the cam groove 34 extends in the overhanging portion 32c. In FIG. 9, the overhanging portion 32c has a trapezoidal shape, and the length in the optical axis direction of the cam cylinder 30 excluding the overhanging portion 32c is L in FIG. In the present embodiment, as will be described later, the length of the cam barrel 30 in the optical axis direction by the length (L1 shown in FIG. 9) of the protruding portion 32c only (the length of the lens barrel unit 2). A).

直進筒４０は、カム筒３０の動作に連動して光軸方向へ移動し、１群筒１２と２群ホルダ２１の回転を規制する。直進筒４０は、円筒部４１と、円筒部４１の３群筒ユニット側の端部に設けられて円筒部４１から径方向の外側に突出した複数の（本実施例では３つの）フランジ部４５と、３つのフランジ部４５の間に形成された３つの切欠部４８と、を有する。   The rectilinear cylinder 40 moves in the optical axis direction in conjunction with the operation of the cam cylinder 30 and restricts the rotation of the first group cylinder 12 and the second group holder 21. The rectilinear cylinder 40 is provided with a cylindrical portion 41 and a plurality of (three in this embodiment) flange portions 45 provided at the end of the cylindrical portion 41 on the third group cylinder unit side and projecting radially outward from the cylindrical portion 41. And three notches 48 formed between the three flange portions 45.

円筒部４１はカム筒３０に挿入される。円筒部４１の外周面には１２０度の等間隔で配置された３つの突起状の係合部４２が形成され、係合部４２はカム筒３０の係合溝３５と係合する。この係合により、カム筒３０と直進筒４０は、光軸方向へ共に移動する。上述したように、傾斜溝３６を有する係合溝３５に直進筒４０の係合部４２がガイドされることにより、カム筒３０と直進筒４０の光軸方向の相対位置が変化する。   The cylindrical part 41 is inserted into the cam cylinder 30. Three projecting engaging portions 42 arranged at equal intervals of 120 degrees are formed on the outer peripheral surface of the cylindrical portion 41, and the engaging portions 42 engage with the engaging grooves 35 of the cam barrel 30. By this engagement, the cam cylinder 30 and the rectilinear cylinder 40 move together in the optical axis direction. As described above, when the engaging portion 42 of the rectilinear cylinder 40 is guided by the engaging groove 35 having the inclined groove 36, the relative position of the cam cylinder 30 and the rectilinear cylinder 40 in the optical axis direction changes.

フランジ部４５は、固定筒７０と係合して固定筒７０の回転を規制する三対の直進キー４６を有する。本実施例では、フランジ部４５の光軸方向の厚さが上述した張り出し部３２ｃの光軸方向の長さに対応する。両者は必ずしも同一でなくてもよい。   The flange portion 45 has three pairs of straight advance keys 46 that engage with the fixed cylinder 70 and restrict the rotation of the fixed cylinder 70. In the present embodiment, the thickness in the optical axis direction of the flange portion 45 corresponds to the length in the optical axis direction of the overhang portion 32c described above. Both are not necessarily the same.

３群筒ユニットはカバー筒５０、回転筒６０、固定筒７０及び撮像素子ユニット８０を有する。固定筒７０の外側にはカバー筒５０と回転筒６０が配置される。撮像素子ユニット８０は、撮像素子８１、３群ホルダ９１、モータ９３等を保持する。   The third group cylinder unit includes a cover cylinder 50, a rotary cylinder 60, a fixed cylinder 70, and an image sensor unit 80. A cover cylinder 50 and a rotating cylinder 60 are disposed outside the fixed cylinder 70. The image sensor unit 80 holds an image sensor 81, a third group holder 91, a motor 93, and the like.

カバー筒５０は、回転筒６０と、撮像素子８１を保持するホルダ８２と共にビス等で固定され、カメラ本体１に保持される。図２に示すように、ホルダ８２はズーム動作の駆動源であるモータ９３と、モータ９３からの動力を伝達するギア列９４を保持している。ギア列９４は回転筒６０の外面に円周方向に設けられたギア６２とかみ合い、回転筒６０は固定筒７０の外周を光軸周りに回転する。   The cover cylinder 50 is fixed with screws or the like together with the rotary cylinder 60 and the holder 82 that holds the image sensor 81, and is held by the camera body 1. As shown in FIG. 2, the holder 82 holds a motor 93 that is a drive source of the zoom operation and a gear train 94 that transmits power from the motor 93. The gear train 94 meshes with a gear 62 provided in the circumferential direction on the outer surface of the rotating cylinder 60, and the rotating cylinder 60 rotates the outer periphery of the fixed cylinder 70 around the optical axis.

図１０は、図４の部分拡大断面図である。キャップ３１の前部３１ａはカム筒３０の開口を狭めると共にカム筒３０の先端の開口の径を側面３１ｃにおいて規定している。カム筒３０の開口には１群筒１２が挿入される。第１筒１２は、カム筒３０の先端（最も被写体側）における開口の径（即ち、側面３１ｃによって規定される開口径）よりも大きな径で突出された環状段差部１７を端部に有する。環状段差部１７の側面１８の径は、環状段差部１７よりも内側の１群筒１２の側面３１ｃに対向する部分の側面１９の径よりも大きい。側面１９よりも側面３１ｃの径が大きい。環状段差部１７にカムピン１６が設けられる。   FIG. 10 is a partially enlarged cross-sectional view of FIG. The front portion 31a of the cap 31 narrows the opening of the cam cylinder 30 and defines the diameter of the opening at the tip of the cam cylinder 30 on the side surface 31c. The first group cylinder 12 is inserted into the opening of the cam cylinder 30. The first cylinder 12 has an annular stepped portion 17 protruding at a diameter larger than the diameter of the opening (that is, the opening diameter defined by the side surface 31c) at the tip (most subject side) of the cam cylinder 30 at the end. The diameter of the side surface 18 of the annular step portion 17 is larger than the diameter of the side surface 19 of the portion facing the side surface 31 c of the first group cylinder 12 inside the annular step portion 17. The diameter of the side surface 31 c is larger than that of the side surface 19. A cam pin 16 is provided on the annular step portion 17.

側面３１ｃと１群筒１２の表面１９との間には隙間ｄ１がある。環状段差部１７が形成する段差（側面１８と側面１９との間の段差）は、隙間ｄ１から侵入した光線Ｂが直進筒４１の内面４４と側面１８との隙間ｄ２に侵入することを防止して遮光性を高めている。また、撮影状態では、環状段差部１７の最も被写体側にある前面１７ａは直進筒４０の最も被写体側にある前面４３よりも被写体側に位置する。   There is a gap d1 between the side surface 31c and the surface 19 of the first group cylinder 12. The step formed by the annular step portion 17 (the step between the side surface 18 and the side surface 19) prevents the light beam B entering from the gap d1 from entering the gap d2 between the inner surface 44 and the side surface 18 of the rectilinear cylinder 41. To improve the light shielding properties. In the photographing state, the front surface 17a closest to the subject side of the annular step portion 17 is located closer to the subject side than the front surface 43 closest to the subject side of the rectilinear barrel 40.

また、後述するように、沈胴状態から撮影状態に移行する過程においてカム筒３０と直進筒４０は相対移動するために、キャップ３１の裏面３１ｄと、直進筒４０の前面４３との間に形成される隙間量は沈胴状態と撮影状態において異なる。   Further, as will be described later, since the cam cylinder 30 and the rectilinear cylinder 40 move relative to each other in the process of shifting from the retracted state to the photographing state, the cam cylinder 30 and the rectilinear cylinder 40 are formed between the back surface 31d of the cap 31 and the front surface 43 of the rectilinear cylinder 40. The gap amount differs depending on the retracted state and the photographing state.

以下、レンズ鏡筒ユニット２の繰り出し及び繰り入れ動作について説明する。   Hereinafter, the extending and retracting operations of the lens barrel unit 2 will be described.

まず、沈胴状態においては、図５及び図７に示すように、カム筒３０の張り出し部３２ｃが直進筒４０の切欠部４８に進入する。沈胴状態は、図９において、係合部４２とフランジ部４５は点線で示す（Ａ）の位置にある。即ち、係合部４２はホーム部３７にあり、フランジ部４５はカム筒３０の円周方向に置いて張り出し部３２ｃと隣り合っている。本実施例は、張り出し部３２ｃを切欠部４８に挿入することによってレンズ鏡筒ユニット２の光軸方向の長さがＬ１だけ短縮している。   First, in the retracted state, as shown in FIGS. 5 and 7, the overhanging portion 32 c of the cam cylinder 30 enters the notch 48 of the rectilinear cylinder 40. In the retracted state, in FIG. 9, the engaging portion 42 and the flange portion 45 are at the position (A) indicated by the dotted line. That is, the engaging portion 42 is in the home portion 37, and the flange portion 45 is placed in the circumferential direction of the cam cylinder 30 and is adjacent to the protruding portion 32 c. In this embodiment, the length of the lens barrel unit 2 in the optical axis direction is shortened by L1 by inserting the overhanging portion 32c into the notch 48.

もし、図９において張り出し部３２ｃを設けなければ、カム溝３４の張り出し部３２ｃに対応する部分が切れることになるから、カム溝３４とカムピン２２の係合が不安定になって２群レンズ９０の移動が不安定になる。一方、もし図９において、カム筒３０の３群筒ユニット側の端面を張り出し部３２ｃの点線で示す端面位置にするとカム溝３４とカムピン２２の係合は安定するがカム筒３０の光軸方向の長さはＬ+Ｌ１となり、小型化が阻害される。   If the overhanging portion 32c is not provided in FIG. 9, the portion of the cam groove 34 corresponding to the overhanging portion 32c is cut off, so that the engagement between the cam groove 34 and the cam pin 22 becomes unstable and the second group lens 90 The movement of becomes unstable. On the other hand, in FIG. 9, if the end surface of the cam cylinder 30 on the third group cylinder unit side is set to the end surface position indicated by the dotted line of the overhanging portion 32c, the engagement of the cam groove 34 and the cam pin 22 is stabilized, but the optical axis direction of the cam cylinder 30 The length becomes L + L1, and the miniaturization is hindered.

次に、沈胴状態から、図４及び図８に示す撮影状態に移行する。撮影状態は、図９において、係合部４２とフランジ部４５は実線で示す（Ｂ）の位置にある。即ち、係合部４２は、係合溝３５に移動し、フランジ部４５は光軸方向において隣り合っている。   Next, the retracted state shifts to the photographing state shown in FIGS. In the photographing state, in FIG. 9, the engaging portion 42 and the flange portion 45 are at the position (B) indicated by the solid line. That is, the engaging part 42 moves to the engaging groove 35, and the flange part 45 is adjacent in the optical axis direction.

係合溝３５は円周方向に延びているため、もし沈胴状態において係合部４２が係合溝３５にある場合には沈胴状態から撮影状態へ移行する過程で係合部４２のカム筒３０内における光軸方向における高さ（位置）が変化しないことになる。係合部４２とフランジ部４５の位置関係は固定であるから、係合部４２の位置が変化しなければフランジ部４５の位置も変化せずに、図９において係合部４２が点線位置から実線位置に移動すると、張り出し部３２ｃに衝突することになる。   Since the engaging groove 35 extends in the circumferential direction, if the engaging portion 42 is in the engaging groove 35 in the retracted state, the cam cylinder 30 of the engaging portion 42 is in the process of shifting from the retracted state to the photographing state. The height (position) in the optical axis direction in the inside does not change. Since the positional relationship between the engaging portion 42 and the flange portion 45 is fixed, the position of the flange portion 45 does not change unless the position of the engaging portion 42 changes. In FIG. If it moves to a solid line position, it will collide with the overhang | projection part 32c.

そこで、本実施例は、係合溝３５に接続されて円周方向に対して傾斜した傾斜溝３６を設けている。そして、係合部４２は沈胴状態から撮影状態へ移行する過程で傾斜溝３６を通過してカム筒３０における光軸方向の位置が変更される。図９においては、係合部４２は、図９において点線位置から実線位置に移動する際に、傾斜溝３６の光軸方向の高さ分だけ右側に移動する。この結果、この高さ分だけフランジ部４５も右側に移動する。この結果、カム筒３０と直進筒４０が光軸方向へ相対移動するため、張り出し部３２ｃはフランジ部４５に衝突することなく、フランジ部４５の前方へ移動する。この高さ分は本実施例では上述のＬ１に相当する。   Therefore, in this embodiment, an inclined groove 36 that is connected to the engaging groove 35 and is inclined with respect to the circumferential direction is provided. The engaging portion 42 passes through the inclined groove 36 in the process of shifting from the retracted state to the photographing state, and the position of the cam tube 30 in the optical axis direction is changed. 9, the engaging portion 42 moves to the right by the height of the inclined groove 36 in the optical axis direction when moving from the dotted line position to the solid line position in FIG. As a result, the flange portion 45 also moves to the right by this height. As a result, the cam cylinder 30 and the rectilinear cylinder 40 move relative to each other in the optical axis direction, so that the overhang portion 32 c moves forward of the flange portion 45 without colliding with the flange portion 45. This height corresponds to the above-described L1 in this embodiment.

沈胴状態から撮影状態に移行する際に、カム溝３３とカムピン１６の係合、カム溝３４とカムピン２２の係合は共に外れることはない。このため、カムピン（カムフォロア）とカム溝との係合が解除されないためにレンズ群の移動は安定する。   When shifting from the retracted state to the photographing state, the engagement between the cam groove 33 and the cam pin 16 and the engagement between the cam groove 34 and the cam pin 22 are not released. For this reason, since the engagement between the cam pin (cam follower) and the cam groove is not released, the movement of the lens group is stabilized.

撮影状態では、図１０に示すように、直進筒４０はカム筒３０に対して後方へ離れ、環状段差部１７の前面１７ａは直進筒４０の前面４３よりも前方へ位置する。そのため、隙間ｄ１から侵入した光線Ｂが、直進筒４０の内面４４に直接的に反射して更に内部に侵入することはなく前面４３で反射され、隙間ｄ２に光線Ｂが進入することを減少させることができる。   In the photographing state, as shown in FIG. 10, the rectilinear cylinder 40 is separated rearward from the cam cylinder 30, and the front surface 17 a of the annular stepped portion 17 is positioned forward of the front surface 43 of the rectilinear cylinder 40. Therefore, the light beam B entering from the gap d1 is directly reflected on the inner surface 44 of the rectilinear cylinder 40 and does not further enter the interior, but is reflected by the front surface 43, thereby reducing the light beam B entering the gap d2. be able to.

撮像装置は、被写体の撮像に適用することができる。   The imaging device can be applied to imaging a subject.

２ レンズ鏡筒ユニット
１１ １群レンズ
１２ １群筒
１７ 環状段差部
１７ａ 前面
１８ 側面
３０ カム筒
３１ キャップ（遮光部材）
３３ カム溝
３５ 係合溝
３６ 傾斜溝
４０ 直進筒
４２ 係合部
４３ 前面
４４ 内面 2 Lens barrel unit 11 First group lens 12 First group cylinder 17 Annular step 17a Front surface 18 Side surface 30 Cam tube 31 Cap (light shielding member)
33 Cam groove 35 Engagement groove 36 Inclined groove 40 Straight cylinder 42 Engaging portion 43 Front surface 44 Inner surface

Claims (4)

沈胴式のレンズ鏡筒ユニットを有する撮像装置であって、
前記レンズ鏡筒ユニットは、
レンズを保持するレンズ保持筒と、
前記レンズ保持筒が挿入される開口と、当該レンズ保持筒と係合して前記レンズの光軸方向への移動を制御するカム溝と、を有するカム筒と、
前記カム筒に挿入及び係合して前記カム筒と共に前記光軸方向に移動する直進筒と、
を有し、
前記レンズ保持筒は、前記カム筒の先端における前記開口の径よりも大きな径で突出された環状段差部を有し、
撮影状態では、前記環状段差部の最も被写体側にある面は前記直進筒の最も被写体側にある面よりも被写体側に位置することを特徴とする撮像装置。 An imaging apparatus having a retractable lens barrel unit,
The lens barrel unit is
A lens holding cylinder for holding the lens;
A cam cylinder having an opening into which the lens holding cylinder is inserted, and a cam groove that engages with the lens holding cylinder and controls movement of the lens in the optical axis direction;
A rectilinear cylinder that is inserted into and engaged with the cam cylinder and moves in the optical axis direction together with the cam cylinder;
Have
The lens holding tube has an annular stepped portion protruding with a diameter larger than the diameter of the opening at the tip of the cam tube,
In the photographing state, the surface of the annular stepped portion that is closest to the subject is located closer to the subject than the surface of the rectilinear cylinder that is closest to the subject. 前記カム筒の先端に設けられた遮光部材を更に有し、
当該遮光部材と前記直進筒との間の隙間量は前記レンズ保持筒が沈胴状態と撮影状態において異なることを特徴とする請求項１に記載の撮像装置。 A light shielding member provided at the tip of the cam cylinder;
The imaging apparatus according to claim 1, wherein an amount of a gap between the light shielding member and the rectilinear tube is different between the retracted state and the photographing state of the lens holding tube. 前記カム筒と前記遮光部材は一体であることを特徴とする請求項２に記載の撮像装置。   The imaging apparatus according to claim 2, wherein the cam cylinder and the light shielding member are integrated. 前記カム筒は、円周方向に延びる係合溝と、当該係合溝に接続されて前記円周方向に対して傾斜した傾斜溝と、を有するカム筒と、
前記直進筒は、前記カム筒の前記係合溝と前記傾斜溝に係合する係合部が形成されて前記カム筒に挿入される円筒部を有し、
前記係合部は沈胴状態から撮影状態へ移行する過程で前記傾斜溝を通過して前記カム筒における前記光軸方向の位置が変更されることによって前記カム筒と前記直進筒が光軸方向へ相対移動することを特徴とする請求項１に記載の撮像装置。 The cam cylinder includes an engagement groove extending in a circumferential direction, and an inclined groove connected to the engagement groove and inclined with respect to the circumferential direction;
The rectilinear cylinder has a cylindrical portion that is inserted into the cam cylinder by forming an engagement portion that engages with the engagement groove and the inclined groove of the cam cylinder;
The engaging portion passes through the inclined groove in the process of shifting from the retracted state to the photographing state, and the position of the cam tube in the optical axis direction is changed, so that the cam tube and the rectilinear tube move in the optical axis direction. The imaging apparatus according to claim 1, wherein the imaging apparatus is relatively moved.
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